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Oued Namous 001
Basic information Name: Oued Namous 001
     This is an OFFICIAL meteorite name.
Abbreviation: ON 001
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 1402 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 53 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 1 Oct 2022
Writeuphelp
Writeup from MB 111:

Oued Namous 001 (ON 001)        32°00’40.73"N, 00°21’46.17"W

Bechar, Algeria

Find: 2021

Classification: Angrite

History: This meteorite was found approximately 15 km east of a major dry riverbed Wadi Al-Namous (aka Oued Namous) and approximately 10 km north of highway N6B in El Bayadh Province, Algeria, in May 2021. Eight pieces plus many fragments weighing a total of 1402 g were purchased by Mark Lyon in 2022.

Physical characteristics: Dark colored exterior covered in patches of smooth fusion crust. Broken surfaces and saw-cut surfaces reveal a fine-grained mosaic of black, green and white colored crystals with scattered gemmy green olivine phenocrysts up to 8 mm in diameter. Spherical vugs are ubiquitous.

Petrography: (C. Agee and A. Ross, UNM) Reflected light microscopy and electron microprobe analysis showed a subophitic texture of Al-Ti bearing high-calcium pyroxenes (with separate populations of Al-Ti bearing diopside-hedenbergite and Al-Ti bearing hedenbergite), euhedral elongate to stubby anorthite, olivine, kirschsteinite, and minor titanomagnetite and troilite. No metal was detected. Vesicular fusion crust was 100-300 μm thick. Ferromagnesian phases showed core to rim compositional zonation. Olivine showed a positive correlation between calcium content and fayalite content.

Geochemistry: (A. Ross and C. Agee, UNM) Al-Ti bearing salite-ferrosalite Fs22.1±3.0Wo51.1±1.3, Fe/Mn=84±6, Al2O3 (wt%)=6.7±1.6, TiO=1.3±0.3 (wt%), n=6; Al-Ti bearing hedenbergite Fs45.4±3.4Wo51.6±1.3, Fe/Mn=136±14, Al2O3=6.0±1.8 (wt%), TiO=3.0±1.0 (wt%), n=5; olivine Fa58.8±19.0Lrn5.6±2.1, range Fa32.3-87.6, Fe/Mn=86±12, n=15; kirschsteinite Fa61.1±2.4Lrn34.4±1.6, Fe/Mn=73±2, n=4; plagioclase An99.7±0.2, n=6; fusion crust (20 μm defocused beam) SiO2=36.5±0.1, TiO2=1.1±0.1, Al2O3=7.4±0.1, Cr2O3=0.06±0.02, MgO=7.5±0.1, FeO=30.0±0.2, MnO=0.33±0.02, CaO=14.1±0.2 (all wt%).

Classification: This is a volcanic angrite based on the significant igneous zoning of olivine and pyroxene. Evidence supporting the angrite classification include the presence of: 1) plagioclase An>99; 2) Al-Ti bearing high-calcium pyroxenes with Fe/Mn up to 149; 3) kirschsteinite; 4) olivine with Fe/Mn up to 111; and 5) spherical vugs typical of volcanic angrites.

Specimens: 22.5 g on deposit at UNM, Mark Lyon holds seven pieces at 865 g plus 230 g of smaller fragments, Luc Labenne holds a single stone of 307 g.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Bechar
Date:2021
Latitude:32°00'40.73"N
Longitude:00°21'46.17"W
Mass (g):1402
Pieces:7
Class:Angrite
Shock stage:low
Weathering grade:low
Fayalite (mol%):58.8±19.0
Ferrosilite (mol%):22.1±3.0, 45.4±3.4
Wollastonite (mol%):51.1±1.3, 51.6±1.3
Classifier:C. Agee, UNM
Type spec mass (g):22.5
Type spec location:UNM
Main mass:Mark Lyon
Comments:Fieldname AF-04; submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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    (Caution, these are of unknown reliability)
Domjan Svilkovic   
Geography:

Algeria
Coordinates:
     Recommended::   (32° 0' 41"N, 0° 21' 46"W)

Statistics:
     This is 1 of 37 approved meteorites from Bechar, Algeria (plus 1 unapproved name)
     This is 1 of 1368 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)
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